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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/drivers/hv/channel_mgmt.c
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@@ -765,11 +765,22 @@
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 		if (completion_done(&vmbus_connection.unload_event))
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 			goto completed;
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-		for_each_online_cpu(cpu) {
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+		for_each_present_cpu(cpu) {
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 			struct hv_per_cpu_context *hv_cpu
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 				= per_cpu_ptr(hv_context.cpu_context, cpu);
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+			/*
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+			 * In a CoCo VM the synic_message_page is not allocated
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+			 * in hv_synic_alloc(). Instead it is set/cleared in
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+			 * hv_synic_enable_regs() and hv_synic_disable_regs()
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+			 * such that it is set only when the CPU is online. If
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+			 * not all present CPUs are online, the message page
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+			 * might be NULL, so skip such CPUs.
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+			 */
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 			page_addr = hv_cpu->synic_message_page;
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+			if (!page_addr)
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+				continue;
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+
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 			msg = (struct hv_message *)page_addr
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 				+ VMBUS_MESSAGE_SINT;
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786
 
..
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@@ -803,11 +814,14 @@
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 	 * maybe-pending messages on all CPUs to be able to receive new
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 	 * messages after we reconnect.
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 	 */
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-	for_each_online_cpu(cpu) {
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+	for_each_present_cpu(cpu) {
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 		struct hv_per_cpu_context *hv_cpu
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 			= per_cpu_ptr(hv_context.cpu_context, cpu);
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 		page_addr = hv_cpu->synic_message_page;
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+		if (!page_addr)
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+			continue;
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+
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 		msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT;
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 		msg->header.message_type = HVMSG_NONE;
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 	}